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Tytuł:
Models for viscosity and density of copper electrorefining electrolytes
Autorzy:
Kalliomaki, T.
Aji, A. T.
Rintala, L.
Aromaa, J.
Lundstrom, M.
Powiązania:
https://bibliotekanauki.pl/articles/109549.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
copper electrorefining
viscosity model
density model
Opis:
Viscosity and density of copper electrorefining electrolytes affect energy consumption and purity of cathode copper. Decreasing the viscosity and density increases the rate of falling of the anode slimes to the bottom of an electrorefining cell and increases the diffusivity and mobility of ions. Increasing the falling rate of the anode slimes decreases a risk of anode slime impurities ending up on the cathode and being entrapped into the copper deposit. This work introduces two new models for both viscosity and density of copper electrorefining electrolytes with high accuracy and one reconstructed improved model for some electrorefining data of viscosity published previously. The experimental work to build up these new models was carried out as a function of temperature (50, 60, 70 °C), copper (40, 50, 60 g/dm3), nickel (0, 10, 20 g/dm3) and sulfuric acid (130, 145, 160 g/dm3) concentrations for all models, and additionally arsenic concentration (0, 15, 30, 32, 64 g/dm3) was included in the viscosity models. Increasing concentrations of Cu, Ni, As and H2SO4 were found to increase the viscosity and density, whereas increasing temperature decreased both viscosity and density. The viscosity models were validated with industrial electrolyte samples from the Boliden Harjavalta Pori tankhouse. The experimental and modeling work carried out in this study resulted in improved viscosity models, having the strongest agreement with the industrial electrorefining electrolytes.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1023-1037
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimising pedestrian flow in a topological network using various pairwise speed-density models
Autorzy:
Khalid, Ruzelan
Nawawi, Mohd Kamal Mohd
Ishak, Nurhanis
Baten, Md Azizul
Powiązania:
https://bibliotekanauki.pl/articles/29127975.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
topological network
speed-density model
optimal arrival rate
network flow model
pedestrian flow
Opis:
A speed-density model can be utilised to efficiently flow pedestrians in a network. However, how each model measures and optimises the performance of the network is rarely reported. Thus, this paper analyses and optimises the flow in a topological network using various speed-density models. Each model was first used to obtain the optimal arrival rates to all individual networks. The optimal value of each network was then set as a flow constraint in a network flow model. The network flow model was solved to find the optimal arrival rates to the source networks. The optimal values were then used to measure their effects on the performance of each available network. The performance results of the model were then compared with that of other speed-density models. The analysis of the results can help decision-makers understand how arrival rates propagate through traffic and determine the level of the network throughputs.
Źródło:
Operations Research and Decisions; 2023, 33, 4; 53--69
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Density of the Copper-Rich Cu-Pb-Fe Alloys
Gęstość stopów Cu-Pb-Fe o dużym stężeniu miedzi
Autorzy:
Sak, T.
Kucharski, M.
Powiązania:
https://bibliotekanauki.pl/articles/356121.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
density
Cu-Pb-Fe alloys
dilatometer method
density model
gęstość
stopy Cu-Pb-Fe
metoda dylatometryczna
model gęstości
Opis:
Density of the copper-rich corner of the ternary Cu-Pb-Fe alloys was determined with the dilatometric method. Investigated alloys had constant copper content equal to 0.9, 0.8 and 0.7 mole fraction, and varied iron concentration up to 0.1 mole fraction. A model predicting the density of ternary solution from knowledge of density of pure component and the excess of molar volume for limiting binaries is proposed.
Gęstość stopów Cu-Pb-Fe o dużym stężeniu miedzi określono za pomocą metody dylatometrycznej. Zbadane stopy charakteryzowały się stałym stężeniem miedzi, które było równe 0,9; 0,8 lub 0,7 ułamka molowego oraz zmiennym stężeniem żelaza do 0,1 ułamka molowego. Zaproponowano model pozwalający przewidywać gęstość trójskładnikowych roztworów na podstawie znajomości gęstości czystych składników (tych roztworów) i nadmiarowej objętości molowej dla granicznych roztworów dwuskładnikowych.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 3A; 1685-1692
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lithospheric structure across the Trans-European Suture Zone in NW Poland based on gravity data interpretation
Autorzy:
Królikowski, C.
Petecki, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2059901.pdf
Data publikacji:
2002
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Trans-European Suture Zone
gravity anomalies
structural-density model
gravity stripping
lithospheric structure
Opis:
We provide an analysis of geophysical and geological data from the Baltic segment of the Trans-European Suture Zone (TESZ). The construction of structural and density maps of the Zechstein-Mesozoic-Cenozoic complex has allowed identification of anomalies of basement orgin. As a result of interpretation of these anomalies, major structural elements of the lithosphere have been characterised. According to gravity modelling the crustal structure is more complicated than shown on velocity model along refraction and wide-angle reflection profile LT-7. Long-wavelength anomalies have been modelled in terms of lateral heterogeneity within the lower crust and upper mantle. In order to achieve a match between the observed and calculated gravity effects, it was necessary to assume dense upper mantle beneath the TESZ. Gravity data also indicate the presence of high-density bodies in the upper crust, and a complex transitional zone between crust and upper mantle in the TESZ.
Źródło:
Geological Quarterly; 2002, 46, 3; 235-246
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geometrical Model to Determine Sewing Thread Consumption for Stitch Class 406
Autorzy:
ur Rehman, Ateeq
Rasheed, Abher
Javed, Zafar
Naeem, M. Salman
Ramzan, Babar
Karahan, Mehmet
Powiązania:
https://bibliotekanauki.pl/articles/2056289.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
sewing thread consumption
stitch class
stitch density
geometric model
Opis:
This study aimed at developing a geometrical model for predicting the sewing thread consumption of stitch class 406. Stitch class 400 is a multi-thread chain stitch which consumes a less amount of thread as compared with stitch class 500 but more thread as compared with stitch class 300. Sewing thread calculation plays a significant role in determining the exact amount of thread for completing a garment and predicting the right quantity of thread for bulk production. The geometrical model developed was used for predicting sewing thread consumption by using different factors like stitch density (8 and 12 SPI), material thickness (2, 4 and 6 layers of fabric), and type of material (denim, knitted and fleece). The model was validated with a total of 18 samples sewn with different kinds of fabric, SPI, and material thickness. It was concluded that the model could predict sewing thread consumption with more than 97.18% accuracy.
Źródło:
Fibres & Textiles in Eastern Europe; 2021, 6 (150); 72--76
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal conductivity of a Brown Earth soil as affected by biochars derived at different temperatures: Experiment and prediction with the Campbell model
Autorzy:
Zhao, B.
Li, L.
Zhao, Y.
Zhang, X.
Powiązania:
https://bibliotekanauki.pl/articles/2082959.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
biochar
bulk density
thermal conductivity
Brown Earth soil
Campbell model
Opis:
Thermal conductivity is a significant heat transfer property of soil. However, the influence of biochar on this property is not well known. In this research, the influence of corn straw biochars prepared at 300, 500 and 700oC on the thermal conductivity of a Brown Earth (Hapli-Udic Cambisol, FAO) soil and its prediction using a Campbell model was examined. The outcomes revealed that the bulk densities of the soil markedly decreased with increases in the biochar amendment rates of 1, 3, and 5% in linear patterns. The reduction in bulk density was mainly attributed to an increase in soil porosity and organic carbon content. With increasing volumetric water contents (10, 20, 30 and 40%), the thermal conductivity of the soils significantly increased, whereas those of soils with biochar amendment were obviously less than that of the CK and the differences increased with the biochar application rates. The pyrolysis temperature of biochar exhibited a negligible effect on the bulk density and thermal conductivity of soils at large. Combining the linear reduction of bulk density with the biochar amendment rate into the Campbell model, well-fitting results for the variation inthermal conductivity versus volumetric water content were obtained and accurate values could be predicted.
Źródło:
International Agrophysics; 2020, 34, 4; 433-439
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spruce tree-ring proxy signals during cold and warm periods
Autorzy:
Esper, Jan
Carnelli, Adriana L.
Kamenik, Christian
Filot, Marc
Leuenberger, Markus
Treydte, Kerstin
Powiązania:
https://bibliotekanauki.pl/articles/956991.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
stable isotopes
maximum latewood density
reconstruction model
picea abies
engadin
alps
Opis:
The strength and temporal rigidity of climate signals are important characteristics of proxy data used to reconstruct climate variability over pre-instrumental periods. Here, we assess the performance of different tree-ring proxies, including ring width, maximum latewood density, δ13C, and δ18O, during exceptional cold (1800–1850) and warm periods (1946–2000). The analysis was conducted at a spruce (Picea abies) timberline site in the Swiss Alps in proximity to long homogenized instrumental records to support calibration tests against early temperature and precipitation data. In this cold environment, tree-ring width, maximum latewood density, and δ18O are mainly controlled by temperature variations. δ13C is influenced by various factors including temperature, precipitation, sunshine, and relative humidity. When comparing the response patterns during cold and warm periods, ring width and maximum latewood density revealed temporally stable temperature signals. In contrast, the association between the stable isotopes and climate changed considerably between the early 19th and late 20th centuries. The temperature signal in δ18O was stronger during the recent warm period, whereas the opposite is true for δ13C. In δ13C, the temperature signal weakened from the early 19th to the late 20th centuries, but an (inverse) precipitation signal evolved indicating that soil moisture conditions additionally limited recent carbon isotope ratios. An attempt to combine the tree-ring proxies in a multiple regression model did not substantially improve the strength of the dominating temperature signal retained in the latewood density data as this proxy already explained a significant fraction of summer temperature variability. Our findings underscore the importance of split calibration/verification approaches including cold and warm periods, and challenge transfer models based on only late 20th century observational data.
Źródło:
Dendrobiology; 2017, 77; 3-18
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of economic and agricultural indicators under sustainable agriculture conditions with the use of Bayesian modelling
Autorzy:
Grotkiewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/297821.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
sustainable agriculture
mineral fertilization
stocking density
agri-economic indicators
Bayesian networks
model
Opis:
Searching for relations between the level of production intensity, land efficiency and work performance, comparative analyses were carried out on international scale taking into consideration 45 countries from around the world with the use of the Statistical Yearbook (2013) and International Statistics Yearbook (2015). The research covered basic qualification criteria of sustainable agriculture, i.e. the level of mineral fertilization and stocking density as well as productivity rates, i.e. land efficiency and work performance and factors which shape them. The main aim of the research is the use of Bayesian modelling in order to predict the development of various economical and agricultural indicators and also show relationships between events basing on the theory of probability.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2017, 20(3); 209-225
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quark star model with Tolman VII Type Potential
Autorzy:
Malaver, Manuel
Powiązania:
https://bibliotekanauki.pl/articles/1192872.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Relativistic objects
anisotropic factor
MIT–Bag model
Tolman VII type potential
Charge density
Opis:
In this paper, we studied the behavior of relativistic objects with charged anisotropic matter distribution within the framework of MIT-Bag Model considering Tolman VII form for the gravitational potential Z. A physical analysis of electromagnetic field indicates that is regular in the origin and well behaved. In the obtained solution there is a singularity in the charge density. We show as the presence of an electrical field causes a modification in the radial pressure, the tangential pressure, the anisotropic factor and the mass of the stellar object.
Źródło:
World Scientific News; 2016, 36; 1-11
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A logical device for processing nautical data
Autorzy:
Filipowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/135599.pdf
Data publikacji:
2017
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
probability density
probability distributions
nautical evidence
uncertainty model
nautical propositions
simple belief structure
Opis:
Nautical measurements are randomly and systematically corrupted. There is a rich scope of knowledge regarding the randomness shown by results of observations. The distribution of stochastic distortions remains an estimate and is imprecise with respect to their parameters. Uncertainties can also occur through the subjective assessment of each piece of available data. The ability to model and process all of the aforementioned items through traditional approaches is rather limited. Moreover, the results of observations, the final outcome of a quality evaluation, can be estimated prior to measurements being taken. This a posteriori analysis is impaired and it is outside the scope of traditional, inaccurate data handling methods. To propose new solutions, one should start with an alternative approach towards modelling doubtfulness. The following article focusses on belief assignments that may benefit from the inclusion of uncertainty. It starts with a basic interval uncertainty model. Then, assignments engaging fuzzy locations around nautical indications are discussed. This fragment includes transformation from density functions to probability distributions of random errors. Diagrams of the obtained conversions are included. The presentation concludes with a short description of a computer application that implements the presented ideas.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 52 (124); 65-73
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wind- and density-driven water circulation in the Southern Baltic Sea - a numerical analysis
Autorzy:
Herman, A.
Jankowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1964085.pdf
Data publikacji:
2001
Wydawca:
Politechnika Gdańska
Tematy:
wind-driven circulation
density currents
hydrodynamic modeling
Stope Channel
Southern Baltic
Princeton Ocean Model
Opis:
The study focuses on the hydrodynamic processes in the southern Baltic Sea, with special interest in the Stolpe Channel - the only deep water connection between Bornholm Basin to the west and Gdansk and Gotland Basins to the east. The Channel is an area of strong interactions of wind- and density-driven currents that may lead to a complex flow structure. A three-dimensional numerical model was applied to an analysis of processes mentioned above. Three model versions of different spatial resolution (5, 3 and 1Nm) were used to investigate an influence of this parameter on the model results. The simulations were performed for four main wind directions, for a variable in time wind speed. It was shown that water circulation in the southern Baltic is to a high degree dependent on local anemobaric conditions. The results confirm the hypothesis of Krauss and Brugge that the flow in the Channel is opposite to the wind direction. Numerical grid step can have a decisive influence on the modeled circulation patterns, especially when barotropic andbaroclinic flow components counteract. In such situations - when the flow is bidirectional and mesoscale eddies are generated - high resolution of the model is particularly important.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 1; 29-58
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling population density using artificial neural networks from open data
Modelowanie gęstości ludności z wykorzystaniem sztucznych sieci neuronowych na podstawie otwartych danych
Autorzy:
Nadolny, Adam
Powiązania:
https://bibliotekanauki.pl/articles/2146817.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Informacji Przestrzennej
Tematy:
population density
artificial neural network
detection model
information extraction
image
gęstość zaludnienia
sztuczna sieć neuronowa
model detekcyjny
ekstrakcja informacji
obraz
Opis:
This paper introduces the concept of creating a model for population density prediction and presents the work done so far. The unit of reference in the study is more the population density of a location rather than tracking human movements and habits. Heterogeneous open data, which can be obtained from the World Wide Web, was adopted for the analysis. Commercial telephony data or social networking applications were intentionally omitted. Both for data collection and later for modeling the potential of artificial neural networks was used. The potential of detection models such as YOLO or ResNet was explored. It was decided to focus on a method of acquiring additional data using information extraction from images and extracting information from web pages. The BDOT database and statistical data from the Central Statistical Office (polish: GUS) were adopted for the base model. It was shown that the use of street surveillance cameras in combination with deep learning methods gives an exam.
W niniejszej pracy przedstawiono koncepcję stworzenia modelu do predykcji gęstości ludności oraz przedstawiono wykonane dotychczas prace. Jednostką odniesienia w badaniach jest bardziej gęstość ludności w danym miejscu niż śledzenie ruchów i nawyków człowieka. Do analizy przyjęto heterogeniczne otwarte dane, które można pozyskać z sieci WWW. Celowo pominięto komercyjne dane telefonii czy aplikacji społecznościowych. Zarówno do gromadzenia danych jak i później do modelowania wykorzystano potencjał sztucznych sieci neuronowych. Zbadano potencjał modeli detekcyjnych takich jak YOLO czy ResNet. Postanowiono skupić się na metodzie pozyskiwania dodatkowych danych z wykorzystaniem ekstrakcji informacji z obrazu oraz pozyskiwania informacji ze stron WWW. Do modelu bazowego przyjęto bazę danych BDOT oraz dane statystyczne z GUS. Wykazano, że wykorzystanie kamer monitoringu ulic w połączeniu z metodami głębokiego uczenia daje egzamin.
Źródło:
Roczniki Geomatyki; 2021, 19, 2(93); 31--43
1731-5522
2449-8963
Pojawia się w:
Roczniki Geomatyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accounting for the random character of nucleation in the modelling of phase transformations in steels
Autorzy:
Poloczek, Łukasz
Kuziak, Roman
Foryś, Jakub
Szeliga, Danuta
Pietrzyk, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/29519774.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
stochastic model
grain size
phase transformations
dislocation density
cooling of rods
heterogeneity of the microstructure
Opis:
In our earlier work, a stochastic model of multi-stage deformation at elevated temperatures was developed. The model was applied to calculate histograms of dislocation density and grain size at the onset of phase transformation. The histograms were used as input data for the simulation of phase transitions using the traditional deterministic model. Following this approach, microstructural inhomogeneity was predicted for different cooling conditions. The results obtained, showing the effect of dislocation density and inhomogeneity of austenite grain size on the microstructural inhomogeneity of the final product, can be considered reliable as they are based on material models determined in previous publications and validated experimentally. The aim of the present work was to extend the model by taking into account the stochastic nature of nucleation during phase transitions. The analysis of existing stochastic models of nucleation was performed, and a model for ferritic transformation in steels was proposed. Simulations for constant cooling rates as well as for industrial cooling processes of steel rods were performed. In the latter case, uncertainties in defining the boundary conditions and segregation of elements were also considered. The reduction of the computing costs is an important advantage of the model, which is much faster when compared to full field models with explicit microstructure representation.
Źródło:
Computer Methods in Materials Science; 2023, 23, 2; 17-28
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical models for quark stars with electric field
Autorzy:
Malaver, Manuel
Powiązania:
https://bibliotekanauki.pl/articles/1178867.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Einstein-Maxwell system
MIT Bag Model
adjustable parameter
charged quark matter
energy density
gravitational potential
Opis:
We found new class of solutions to the Einstein-Maxwell system of equations for charged quark matter within the framework of MIT Bag Model considering a prescribed form of gravitational potential Z(x) used by Malaver (2016), which depends on an adjustable parameter n. Variables as the energy density, charge density, pressure and the metric functions are written in terms of elementary and polynomial functions. We show that the form chosen for the gravitational potential allows obtain physically acceptable solutions with any value of the adjustable parameter.
Źródło:
World Scientific News; 2017, 89; 39-47
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of density stratification on effluent plume dynamics
Autorzy:
Loncar, G.
Paklar, G.B.
Janekovic, I.
Powiązania:
https://bibliotekanauki.pl/articles/47653.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
3D numerical model
Croatia
density stratification
numerical model
numerical simulation
Rijeka Bay
salinity
sea temperature
statistical analysis
submarine outfall
submarine sewage
Opis:
In this study we modelled sea temperature (T ), salinity (S) and density field dynamics using a 3D numerical model applied to Rijeka Bay (Croatia) in order to explore their effect on effluent plume dynamics in the vicinity of four submarine sewage outfalls when the bora wind (NE direction) is blowing. The vertical density stratification in the area studied is strongly related to the bora wind, which contributes significantly to the lowering of the pycnocline depth through enhanced mixing in the vertical, giving rise to changes in the neutral buoyancy level. The features of near-field plume dynamics were calculated with the use of a separate near-field numerical model, using information on the vertical density distribution previously calculated using a 3D numerical model. The results of the numerical simulations and statistical analysis of the wind data indicate a very low probability of complete water column homogenization and consequent effluent plume rise to the sea surface under the influence of the bora wind during the peak tourist season (May–September).
Źródło:
Oceanologia; 2011, 53, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
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